<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        /* 选择器权重 */
        .title2
        {
            color:chocolate !important;
        }
        .title
        {
            color: brown;
        }
        
        #txt
        {
            color: blue;
        }
        h1
        {
            color: chartreuse;
        }
    </style>
</head>
<body>
    <h1 class="title title2"id=>hello，world</h1>
</body>
</html>